制造工艺生产设备应根据设备使用的环境确定所用的材料,在深冷操作中可采用的材料是()。

Can you imagine a classroom without one thing that has long been considered a necessary part? No notebooks, no textbooks, no test papers. Nor are there any pencils or pens, which always seem to run out of ink at the critical moment.

A “Paperless classroom” is what more and more schools are trying to realize. Students don’t do any handwriting in this class. Instead, they use hand-sized or specially-designed computers. The teacher downloads texts from Internet libraries and sends them to every student’s personal computer.

Having computers also means that students can use the Web. They can look up information on any subject they’re studying, from maths to social science.

A high school teacher, Judy Herrel in Florida, US, described how her class used the Web. “Using a book that’s three or four years old is impossible,” she said.

A paperless classroom is a big step towards reducing the waste of paper.

“Think about the money and trees we could save with the computers,” she said.

But, with all this technology, there’s always a risk that the machines will break down. So, in case of a power failure or a technical problem, paper textbooks should still be widely available (可得到的) for these students.

小题1:The underlined word “critical” in the first paragraph probably has the same meaning as _______.

A．worrying

B．dangerous

C．happy

D．important小题2:You are sure to find __________ in a paperless classroom.

A．pens

B．computers

C．test papers

D．notebooks小题3:According to Judy Herrel, __________.

A．the Web can talk the students everywhere

B．the Web can take the place of teachers

C．the Web is a better tool for information

D．the Web is for downloading information小题4:The paper textbooks should still be widely available because __________.

A．students won’t have trouble with their pens

B．computers may break down sometimes

C．students may not get all information from the Internet

D．paper textbooks may give students more information

患者，吴先生，50岁，因反复发作劳累性心绞痛，诊断为"心绞痛型冠心病"。使用硝酸类药物时

正确的措施是（）。

A.告知患者舌下保留一些唾液，让药物完全溶解后再咽下

B.硝甘含服后，未达到预期效果时，及时告知医生

C.含药时应平卧片刻

D.静脉注射硝甘应慢速

E.出现头晕，头胀痛，面红等症状应停药

阅读下面这首诗，完成问题。

注释：①社肉：祭土地神的肉。

1．“一路稻花谁是主？红蜻蛉伴绿螳螂”是千古名句，句中“伴”字用得妙，请写出你的理解。

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2．这首诗抒发了诗人怎样的思想感情？

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fclose(fp);

已知在一定温度下

SO3（g）SO2（g）+O2，K1=0.050

NO2（g）NO（g）+O2，K2=0.012

则在相同条件下

SO2（g）+NO2（g）SO3（g）+NO（g）

反应的平衡常数K为：（）

A.0.038

B.4.2

C.0.026

D.0.24